The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform
Jinlong Fang - One of the best experts on this subject based on the ideXlab platform.
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A Novel Computational Method of Skewing Leakage Reactance for a Doubly Skewed Rotor Induction Motor
IEEE Transactions on Energy Conversion, 2018Co-Authors: Xiaohua Bao, Jinlong FangAbstract:In this paper, a novel computational method that can accurately calculate the skewing leakage reactance of a doubly skewed Rotor Induction Motor is proposed. It is based on the three-dimensional finite-element models to calculate the magnetic energy stored in every section of the machine and the Rotor bar currents. In addition, the magnetic saturation and magnetic variation in the axial direction are taken into account in the models. Also, the proposed method is applied to calculate the stator leakage reactances and Rotor leakage reactances. The comparisons between the testing results and the computational results show that the proposed method can obtain the more accurate results than the conventional computational algorithm.
Janne Nerg - One of the best experts on this subject based on the ideXlab platform.
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high speed high output solid Rotor Induction Motor technology for gas compression
IEEE Transactions on Industrial Electronics, 2010Co-Authors: Juha Pyrhonen, P. Kurronen, Janne Nerg, U LauberAbstract:This paper investigates the suitability of solid-Rotor Induction-Motor technology for a natural-gas-compression application with a high power output. To this end, a new solid-Rotor design for an 8-MW 6.6-kV 12 000-min-1 Motor without any copper parts in the Rotor was developed, and the Motor performance was tested. In this paper, solid-Rotor material selection, Rotor slitting, and the end effects of the purely solid Rotor are discussed. A frequency-dependent end-effect correction factor is introduced, and a method for the Rotor-end-leakage correction is presented. The performance of the proposed end-effect correction factor is verified by comparing the calculated torque and power factor with the measured values.
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Electromagnetic and mechanical design aspects of a high-speed solid-Rotor Induction machine with no separate copper electric circuit in the megawatt range
Electrical Engineering, 2009Co-Authors: Juha Pyrhonen, Janne Nerg, Aki Mikkola, Jussi Sopanen, Tuomo AhoAbstract:The most crucial electro-magnetic and mechanical design aspects of an integrated electrical-Motor–gas-compressor system in high speed and high power operation are presented. The electric Motor type considered is a solid-Rotor Induction Motor with properties of which are particularly well suited in high-speed operation. The effect of the electro-magnetic material properties of the solid Rotor core material on the performance of the machine is discussed. Guidelines to improve the performance of the solid-Rotor Induction Motor are given. Thermal design aspects of a solid-Rotor Induction Motor are presented. The mechanical properties of a solid Rotor are discussed. Bearing arrangements as well as the Rotor dynamics of an integrated system are presented.
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High-speed, 8 MW, solid-Rotor Induction Motor for gas compression
2008 18th International Conference on Electrical Machines, 2008Co-Authors: Juha Pyrhonen, P. Kurronen, Janne Nerg, Uwe LauberAbstract:The suitability of solid Rotor technology in a high power output hermetic natural gas compression application was studied. Two new solid-Rotor designs for an 8 MW, 6.6 kV, 12000 min-1 and a 10 MW machine were done and the Motors successfully tested. The former carries a purely solid, slitted Rotor and the latter has a copper cage manufactured of copper bars inserted in solid Rotor core drill bores.
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Thermal modeling of a high-speed solid-Rotor Induction Motor
2006Co-Authors: Janne NergAbstract:A thermal model based on the lumped parameters for a high-speed solid-Rotor Induction Motor with a slitted Rotor is presented. The Motor geometry is divided into 14 parts where the thermal resistances as well as different loss components, i.e. electromagnetic, gas flow and friction losses are computed. The model takes into account the heat transfer both in axial and radial directions of the Motor. The evaluation of different loss components is discussed in detail.
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The Effect of the Number of Rotor Slits on the Performance Characteristics of Medium-Speed Solid Rotor Induction Motor
3rd IET International Conference on Power Electronics Machines and Drives (PEMD 2006), 2006Co-Authors: T. Aho, Janne Nerg, Juha PyrhonenAbstract:The effect of the number of Rotor slits on the electromagnetic torque production, torque ripple, Rotor eddy-current loss and the power factor are numerically studied in case of a three phase, two-pole, 200 Hz, solid-Rotor Induction Motor. The number of the stator slots was 48 and the number of the Rotor slits was varied from 28 to 36. The depth of the Rotor slits was kept at a constant value in all the calculations. The harmonic content of the air-gap flux density as well as the electromagnetic torque at each Rotor slit number were studied in detail. It was also found that when the number of the Rotor slits was an odd number, an unsymmetrical magnetic pull affects between the stator and the Rotor.
Juha Pyrhonen - One of the best experts on this subject based on the ideXlab platform.
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high speed high output solid Rotor Induction Motor technology for gas compression
IEEE Transactions on Industrial Electronics, 2010Co-Authors: Juha Pyrhonen, P. Kurronen, Janne Nerg, U LauberAbstract:This paper investigates the suitability of solid-Rotor Induction-Motor technology for a natural-gas-compression application with a high power output. To this end, a new solid-Rotor design for an 8-MW 6.6-kV 12 000-min-1 Motor without any copper parts in the Rotor was developed, and the Motor performance was tested. In this paper, solid-Rotor material selection, Rotor slitting, and the end effects of the purely solid Rotor are discussed. A frequency-dependent end-effect correction factor is introduced, and a method for the Rotor-end-leakage correction is presented. The performance of the proposed end-effect correction factor is verified by comparing the calculated torque and power factor with the measured values.
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Electromagnetic and mechanical design aspects of a high-speed solid-Rotor Induction machine with no separate copper electric circuit in the megawatt range
Electrical Engineering, 2009Co-Authors: Juha Pyrhonen, Janne Nerg, Aki Mikkola, Jussi Sopanen, Tuomo AhoAbstract:The most crucial electro-magnetic and mechanical design aspects of an integrated electrical-Motor–gas-compressor system in high speed and high power operation are presented. The electric Motor type considered is a solid-Rotor Induction Motor with properties of which are particularly well suited in high-speed operation. The effect of the electro-magnetic material properties of the solid Rotor core material on the performance of the machine is discussed. Guidelines to improve the performance of the solid-Rotor Induction Motor are given. Thermal design aspects of a solid-Rotor Induction Motor are presented. The mechanical properties of a solid Rotor are discussed. Bearing arrangements as well as the Rotor dynamics of an integrated system are presented.
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High-speed, 8 MW, solid-Rotor Induction Motor for gas compression
2008 18th International Conference on Electrical Machines, 2008Co-Authors: Juha Pyrhonen, P. Kurronen, Janne Nerg, Uwe LauberAbstract:The suitability of solid Rotor technology in a high power output hermetic natural gas compression application was studied. Two new solid-Rotor designs for an 8 MW, 6.6 kV, 12000 min-1 and a 10 MW machine were done and the Motors successfully tested. The former carries a purely solid, slitted Rotor and the latter has a copper cage manufactured of copper bars inserted in solid Rotor core drill bores.
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The Effect of the Number of Rotor Slits on the Performance Characteristics of Medium-Speed Solid Rotor Induction Motor
3rd IET International Conference on Power Electronics Machines and Drives (PEMD 2006), 2006Co-Authors: T. Aho, Janne Nerg, Juha PyrhonenAbstract:The effect of the number of Rotor slits on the electromagnetic torque production, torque ripple, Rotor eddy-current loss and the power factor are numerically studied in case of a three phase, two-pole, 200 Hz, solid-Rotor Induction Motor. The number of the stator slots was 48 and the number of the Rotor slits was varied from 28 to 36. The depth of the Rotor slits was kept at a constant value in all the calculations. The harmonic content of the air-gap flux density as well as the electromagnetic torque at each Rotor slit number were studied in detail. It was also found that when the number of the Rotor slits was an odd number, an unsymmetrical magnetic pull affects between the stator and the Rotor.
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Electromagnetic field analysis of 3D structure of axial-flux solid-Rotor Induction Motor
International Symposium on Power Electronics Electrical Drives Automation and Motion 2006. SPEEDAM 2006., 1Co-Authors: M.sc.m. Valtonen, D.sc.a. Parviainen, Juha PyrhonenAbstract:This paper discusses experience in applying time harmonic three-dimensional (3D) finite element (FE) analysis in analyzing an axial-flux (AF) solid-Rotor Induction Motor (IM). The Motor is a single Rotor - single stator AF IM. The construction presented in this paper has not been analyzed before in any technical documents. The field analysis and the comparison of torque calculation results of the 3D calculations with measured torque results are presented
Xiaohua Bao - One of the best experts on this subject based on the ideXlab platform.
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A Novel Computational Method of Skewing Leakage Reactance for a Doubly Skewed Rotor Induction Motor
IEEE Transactions on Energy Conversion, 2018Co-Authors: Xiaohua Bao, Jinlong FangAbstract:In this paper, a novel computational method that can accurately calculate the skewing leakage reactance of a doubly skewed Rotor Induction Motor is proposed. It is based on the three-dimensional finite-element models to calculate the magnetic energy stored in every section of the machine and the Rotor bar currents. In addition, the magnetic saturation and magnetic variation in the axial direction are taken into account in the models. Also, the proposed method is applied to calculate the stator leakage reactances and Rotor leakage reactances. The comparisons between the testing results and the computational results show that the proposed method can obtain the more accurate results than the conventional computational algorithm.
S. Tunyasrirut - One of the best experts on this subject based on the ideXlab platform.
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a dsp based modified slip energy recovery drive using a 12 pulse converter and shunt chopper for a speed control system of a wound Rotor Induction Motor
Electric Power Systems Research, 2008Co-Authors: S. Tunyasrirut, Jongkol Ngamwiwit, T. Furuya, Vijit Kinnares, Y. YamamotoAbstract:Abstract This paper introduces a modified slip energy recovery drive system for speed control of a wound Rotor Induction Motor offering improvement of drive performance, particularly line power factor and overall system efficiency. A 12-pulse line commutated thyristor converter operating in an inverter mode in conjunction with an additional IGBT shunt chopper is employed to transfer slip energy back to ac mains supply via three phase transformers. This approach offers Motor speed control by varying the duty cycle of the chopper instead of changing the inverter firing angle. As a consequence, supply power factor can be improved. The servo state feedback designed by linear quadratic regulator (LQR) with observer is also included in order to keep Motor speed to be constant over a certain range of operating conditions by using the estimated dc link current derived from Motor speed. The advantage of this technique is absence of current transducers for current feedback control loop. The overall control system is implemented on DSP, DS1104’TMS320F240 controller board. Experimental results are illustrated in order to validate performance of the proposed system.
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Adaptive fuzzy-neuro controller for speed of wound Rotor Induction Motor with slip energy recovery
2000 TENCON Proceedings. Intelligent Systems and Technologies for the New Millennium (Cat. No.00CH37119), 1Co-Authors: S. Tunyasrirut, Jongkol Ngamwiwit, T. Furuya, Y. YamamotoAbstract:In this paper, the authors proposed an adaptive fuzzy-neuro controller to control the speed of a wound Rotor Induction Motor with slip energy recovery. An adaptive fuzzy-neuro controller has been designed by integrating two neural network models with a basic fuzzy logic controller. Using the backpropagation algorithm, the first neural network is trained as a plant emulator and the second neural network is used as a compensator for the basic fuzzy controller to improve its performance online. The function of the neural network plant emulator is to provide the correct error signal at the output of the neural fuzzy compensator without the need for any mathematical modeling of the plant. The scheme is applied to the control of the speed of the wound Rotor Induction Motor process. Simulation and experimental results show that the adaptive fuzzy-neuro controller gives constant speed and good transient response without overshoot.
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Implementation of a dSPACE-based digital state feedback controller for a speed control of wound Rotor Induction Motor
2005 IEEE International Conference on Industrial Technology, 1Co-Authors: S. TunyasrirutAbstract:This paper presents the performances of a linear control technique implemented on a state feedback to control speed of wound Rotor Induction Motor using dSPACE along with the Matlab/Simulink tool. This scheme leads to be able to adjust the speed of the Motor by control the firing angle of the twelve pulse line commutated converter. The converter operating as an inverter and then passed through the wye-wye and delta-wye transformer circuit in order to reduce harmonics of line current waveforms. The digital state feedback controller is applied to speed signal model of the slip energy recovery system and is then downloaded to dSPACE through Simulink. The experimental results are analyzed and compared simulation in testing the 0.22 kW wound Rotor Induction Motor from no-load condition to rated condition, it's found that the Motor speed to be constant when the load varies, as shown the effectiveness of the proposed control scheme
